as the title says... would a rising rate fuel pressure regulator have any positive effect on the higher compression engine of the ralliarts?

cheers

Unmodified? or modified..

Unmodified: Id say you wouldnt see any beneficial results as the car should be running fine on its stock fuel lines/pump. Unless your car is leaning out somehow, then there wouldnt be a need for one?

I found it fitting one improved throttle response and helped eliminate the 'flat spot' usually associated with a certain brand of aftermarket air filters.

Having said that - it could have been a "placebo" effect brought on by paying $300+ for a piece of metal and a few rubber hoses and hose clamps.

Honestly, I felt an improvement. Was it worth it?? - I guess thats all relative. I've got a feeling you have the "Barry" fuel rail kit fitted to your car (or else I'm confusing you with someone else) - if so, it is likely you will get less benefit from a FPR than someone like myself who previously fitted the FPR to a car without the fuel rail kit installed.

Hope that helps.

ok cheers mate :thumbsup:

yes i do have the "barry" lean out kit lol

and bain, its for my car, being said ralliart, being slightly modified... lol

i got a rising rate on mine,
they suggested this one because i will be goin turbo later on,
it also helps with the happy-G

so there would be no real benefit until i put a turbo on?

']so there would be no real benefit until i put a turbo on?
Looks like you're going to have to put a turbo on it then! :badgrin:

thats the plan... lol


just need some money to get me started :bowrofl:

best FPR on the market is the SARD Racing i've been told

$ value?

u'll also need a special adaptor made up so that u can take out the original one...

i have a spare one of these ;)

ooh awesome...

goody n shiit :D

might investigate what these are worth, then ill get ya on msn :thumbsup:

the kits are $300+ some crap like that

ohh i also have a spare reg in my garage too
cept it dont have the top bolt and these are just impossible to find...
otherwise its like $190 i payed for mine to be installed

SARD Racing fpr's can be picked up on evilbay for $200 and under.
http://cgi.ebay.com.au/SARD-Fuel-Press-Reg-SILVIA-SKYLINE-WRX-EVO-SUPRA-200SX_W0QQitemZ4600068703QQcategoryZ43808QQssPageN ameZWDVWQQrdZ1QQcmdZViewItem

']so there would be no real benefit until i put a turbo on?
Or high comp NA..

Read up on what a FPR does Seafood. You need to get a good understanding of the products before just forking out $$$ for them.

No point in installing items that will have little to no benefit until you fork out thousands of dollars on additional mods

I'm with Bain on this one, my understanding of a rising rate FPR is that they increase fuel pressure inline with force inducted boost. This keeps a constant fuel pressure in conjuction with the huge air increase and thus keeping the A/F ratio at an optimum rate.

Seeing as you'll have no boost on a N/A car it'll do very little bar running off of intake vacuum thus leaning the A/F mixture a little under normal driving conditions (i guess saving a little on economy over piston life) and return to the normal fuel pressure under WOT conditions.

Personally i think the 200-300 dollars would be best saved until you have the mods to support the need for a rising rate FPR.

no worries, cheers :D

I'm with Bain on this one, my understanding of a rising rate FPR is that they increase fuel pressure inline with force inducted boost. This keeps a constant fuel pressure in conjuction with the huge air increase and thus keeping the A/F ratio at an optimum rate.A rising rate FPR increases fuel pressure disproportionately with manifold pressure, hence the name rising rate.

Don't confuse a rising rate FPR with a boost sensing FPR. They do different things.

Don't confuse a rising rate FPR with a boost sensing FPR. They do different things.
you're a mechanical N/A buff... would it be good or waste of time?

an N/A buff maybe, but certainly no expert lol

I've got one on my car though.. primarily because I needed a higher rail pressure than the factory regulator could supply. Whether the rising rate feature is adding anything, I don't know, but I can't see how it would be hurting to be increasing fuel pressure faster than it's "required".